/*
    * Copyright (c) 2002-2021, City of Paris
    * All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    *
    *  1. Redistributions of source code must retain the above copyright notice
   *     and the following disclaimer.
   *
   *  2. Redistributions in binary form must reproduce the above copyright notice
   *     and the following disclaimer in the documentation and/or other materials
   *     provided with the distribution.
   *
   *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
   *     contributors may be used to endorse or promote products derived from
   *     this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   * License 1.0
   */
  package fr.paris.lutece.plugins.asynchronousupload.service;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.SequenceInputStream;
  import java.io.UnsupportedEncodingException;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import org.apache.commons.fileupload.FileItem;
  import org.apache.commons.fileupload.FileItemHeaders;
  import org.apache.commons.io.FilenameUtils;
  import org.apache.commons.io.IOUtils;
  
  import fr.paris.lutece.portal.service.util.AppLogService;
  import fr.paris.lutece.util.filesystem.UploadUtil;
  
  /**
   * File item witch contains a list of partial file item
   */
  public class PartialFileItemGroup implements FileItem
  {
      private static final long serialVersionUID = 8696893066570050604L;
      private List<FileItem> _items;
      private SequenceInputStream _sequenceInputStream;
  
      /**
       * Instantiates a new normalize file item.
       *
       * @param item
       *            the item
       */
      public PartialFileItemGroup( List<FileItem> items )
      {
          _items = items;
          List<InputStream> vOut = new ArrayList<>( );
  
          try
          {
  
              for ( FileItem fileItem : items )
              {
                  vOut.add( fileItem.getInputStream( ) );
  
              }
          }
          catch( IOException e )
          {
              AppLogService.error( "error creating Partial File item sequence inputstream", e );
          }
          _sequenceInputStream = new SequenceInputStream( Collections.enumeration( vOut ) );
  
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void delete( )
      {
          for ( FileItem item : _items )
          {
             item.delete( );
         }
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public byte [ ] get( )
     {
 
         byte [ ] bReturn = null;
         try
         {
             bReturn = IOUtils.toByteArray( _sequenceInputStream );
         }
         catch( IOException e )
         {
             AppLogService.error( "error getting Partial File item  inputstream", e );
 
         }
         return bReturn;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getContentType( )
     {
         return _items.get( 0 ).getContentType( );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getFieldName( )
     {
         return _items.get( 0 ).getFieldName( );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public InputStream getInputStream( ) throws IOException
     {
         return _sequenceInputStream;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getName( )
     {
         return UploadUtil.cleanFileName( FilenameUtils.getName( _items.get( 0 ).getName( ) ) );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public OutputStream getOutputStream( ) throws IOException
     {
         return null;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public long getSize( )
     {
         return _items.stream( ).collect( Collectors.summingLong( FileItem::getSize ) );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getString( )
     {
         return _items.get( 0 ).getString( );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getString( String encoding ) throws UnsupportedEncodingException
     {
         return _items.get( 0 ).getString( encoding );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isFormField( )
     {
         return _items.get( 0 ).isFormField( );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isInMemory( )
     {
         return _items.get( 0 ).isInMemory( );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setFieldName( String name )
     {
         _items.get( 0 ).setFieldName( name );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setFormField( boolean state )
     {
         _items.get( 0 ).setFormField( state );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void write( File file ) throws Exception
     {
         // Nothing
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public FileItemHeaders getHeaders( )
     {
         return _items.get( 0 ).getHeaders( );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setHeaders( FileItemHeaders headers )
     {
         // No Default Headers
     }
 }